Heya. I love the improved perfect breeder design, and also rather enjoy the Mark II-1 B. Anyway, this seems to be the place to post good reactors, so I'll submit mine here and try to follow your format.
Mark III/IV EB (1000s/1250s), Efficiency 3.60, 10 uranium cells, 180 EU/t
Very good efficiency, higher effective EU/t (energy generated divided by run time + cooldown) than Nargon's Mark IV B (625s), and can run for a little over a tenth of a cycle without losing components.
Great reactor for those looking for high efficiency, without making a Mark V (they're scary).
Materials:
18x Integrated heat dispensers
26x Cooling cells
Colour coded!
U = Uranium cell
C = Cooling cell
D = Integrated heat dispenser
D C C C C C C C D
C C D D D D D C C
C D U U U U U D C
C D U U U U U D C
C C D D D D D C C
D C C C C C C C D
Heating:
6x uranium cells, 4 pulses, 1 cooler slot (10 heat each)
4x uranium cells, 3 pulses, 2 cooler slot (4 heat each)
6x4x1x10 + 4x3x2x4 = 336 h/s
Cooling:
1 Reactor, 6 chambers, 20 water blocks, 26 cooling cells
1 + 2x6 + 20 + 26 = 59 h/s
Heat balance:
336 - 59 = +277 h/s
Heat distribution:
1 reactor, 18 heat dispensers, 26 cooling cells
1 + 18 + 26 = 45, each can accumulate 10k heat
450000/277 = max 1624s of non-stop running, if you don't mind losing components. Max 1101s of non-stop running without losing components.
1624s, greater than 1/10 of a cycle, with loss of components => Mark IV.
1101s, greater than 1/10 of a cycle, without loss of components => Mark III.
A good time for this is 1000s of non-stop running, because that'll let you get ten cycles of the same length before the uranium is depleted.
WARNING! Make sure you use special water construction (see Nargon's Perfect Breeder for details).
Cooldown:
After 1000s accumulated heat is 1000x277 = 277000h
277000/59 = 4695s = 1h 18.25m
Energy:
6x Uranium cells, 4 pulses
4x Uranium cells, 3 pulses
6x4x5 + 4x3x5 = 180 EU/t
Total EU after 1000s:
180x20x1000 = 3.6M EU.
If anyone can improve upon this design, please post below. And once again, great work Nargon.
EDIT:
I posted a tutorial on making a self-regulating nuclear reactor.
http://forum.industrial-craft.…ad&postID=25247#post25247